Infosys React Developer Interview Questions and Answers

SDLC lifecycle stands for Software Development Life Cycle, which is a process used by software development teams to design, develop, and test high-quality software.

• SDLC lifecycle consists of several phases including planning, analysis, design, implementation, testing, and maintenance.

• Each phase has its own set of activities and deliverables to ensure the successful completion of the software project.

• Examples of SD...read more

useState is a hook in React that allows functional components to have state.

• useState is a built-in hook in React.

• It allows functional components to have stateful logic.

• useState returns an array with two elements - the current state value and a function to update that value.

• Example: const [count, setCount] = useState(0);

Useeffect is a hook in React that allows performing side effects in function components.

• Useeffect is used to perform side effects in function components.

• It runs after every render by default.

• It can be used to fetch data, subscribe to events, or update the DOM.

• It can also clean up effects by returning a function.

• Dependencies can be specified to control when the effect runs.

Responsive design is creating web applications that adapt to different screen sizes and devices.

• Use media queries in CSS to adjust styles based on screen size

• Utilize flexible grids and layouts to ensure content adjusts accordingly

• Test the design on various devices and screen sizes to ensure responsiveness

map returns a new array with modified elements, forEach executes a function for each element in an array.

• map returns a new array, forEach does not

• map modifies the elements of the array, forEach does not

• map returns the same number of elements as the original array, forEach does not necessarily

• forEach is used for side effects, map is used for transformation

Lifecycle methods are methods that get called at various stages of a component's life.

• componentDidMount() - called after component is mounted

• shouldComponentUpdate() - determines if component should update

• componentDidUpdate() - called after component is updated

• componentWillUnmount() - called before component is unmounted